Take a few drops of this solution on a clear slide, dust a few pollen grains from the stamen of a mature flower in it.

Obverse the slide under the microscope after 5 minutes. Keep observing the slide regularly after intervals of half an hour.

Observations:

In a nutrient solution or nutrient-rich medium, the pollen grains germinate. The tube/vegetative cell enlarges and comes out the pollen grains through one of the germ pores to form a pollen tube. The generative cell nucleus soon passes into it and dives to make 2 sperm nuclei (male gametes). Each male gamete is lenticular to spherical in outline.